slab: Update MAINTAINERS entry

Add the two Documentation files to the maintainers entry.  Simplify the
match for header files now that there is only slab.h.  Move Vlastimil
to the top of the list of maintainers since he's the one doing the pull
requests.  Change David & Christoph's roles to Reviewer.  Expand the
pattern for files in mm/ so that somebody searching for 'slub' will
find it.

Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Acked-by: Harry Yoo <[email protected]>
Acked-by: David Rientjes <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Vlastimil Babka <[email protected]>

Author: Matthew Wilcox (Oracle)

MAINTAINERS

@@ -22820,17 +22820,21 @@ F:	Documentation/devicetree/bindings/nvmem/layouts/kontron,sl28-vpd.yaml
 F:	drivers/nvmem/layouts/sl28vpd.c
 
 SLAB ALLOCATOR
-M:	Christoph Lameter <[email protected]>
-M:	David Rientjes <[email protected]>
-M:	Andrew Morton <[email protected]>
 M:	Vlastimil Babka <[email protected]>
+M:	Andrew Morton <[email protected]>
+R:	Christoph Lameter <[email protected]>
+R:	David Rientjes <[email protected]>
 R:	Roman Gushchin <[email protected]>
 R:	Harry Yoo <[email protected]>
 L:	[email protected]
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git
-F:	include/linux/sl?b*.h
-F:	mm/sl?b*
+F:	Documentation/admin-guide/mm/slab.rst
+F:	Documentation/mm/slab.rst
+F:	include/linux/slab.h
+F:	mm/slab.h
+F:	mm/slab_common.c
+F:	mm/slub.c
 
 SLCAN CAN NETWORK DRIVER
 M:	Dario Binacchi <[email protected]>